Converted CFX_Matrix::TransformRect() to take in consts

Currently, all three of CFX_Matrix::TransformRect() take in rect values
and modify them in place.

This CL converts them to take in constant values and return the
transformed values instead, and fixes all the call sites.

Bug=pdfium:874

Change-Id: I9c274df3b14e9d88c100ba0530068e06e8fec32b
Reviewed-on: https://pdfium-review.googlesource.com/11550
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Jane Liu <janeliulwq@google.com>

4 files changed, 8 insertions, 13 deletions

diff --git a/xfa/fwl/cfwl_edit.cpp b/xfa/fwl/cfwl_edit.cpp
index fc8b0fa888..127c258d04 100644
--- a/xfa/fwl/cfwl_edit.cpp
+++ b/xfa/fwl/cfwl_edit.cpp
@@ -228,7 +228,7 @@ void CFWL_Edit::DrawSpellCheck(CXFA_Graphics* pGraphics,
     CFX_RectF rtClip = m_rtEngine;
     CFX_Matrix mt(1, 0, 0, 1, fOffSetX, fOffSetY);
     if (pMatrix) {
-      pMatrix->TransformRect(rtClip);
+      rtClip = pMatrix->TransformRect(rtClip);
       mt.Concat(*pMatrix);
     }
     pGraphics->SetClipRect(rtClip);
@@ -511,7 +511,7 @@ void CFWL_Edit::DrawContent(CXFA_Graphics* pGraphics,
   float fOffSetY = m_rtEngine.top - m_fScrollOffsetY + m_fVAlignOffset;
   CFX_Matrix mt(1, 0, 0, 1, fOffSetX, fOffSetY);
   if (pMatrix) {
-    pMatrix->TransformRect(rtClip);
+    rtClip = pMatrix->TransformRect(rtClip);
     mt.Concat(*pMatrix);
   }
 
@@ -609,7 +609,7 @@ void CFWL_Edit::RenderText(CFX_RenderDevice* pRenderDev,
     rtDocClip.width = static_cast<float>(pRenderDev->GetWidth());
     rtDocClip.height = static_cast<float>(pRenderDev->GetHeight());
   }
-  mt.GetInverse().TransformRect(rtDocClip);
+  rtDocClip = mt.GetInverse().TransformRect(rtDocClip);
 
   std::vector<FXTEXT_CHARPOS> char_pos;
 
@@ -1130,8 +1130,7 @@ void CFWL_Edit::ShowCaret(CFX_RectF* pRect) {
   if (!pDocEnvironment)
     return;
 
-  CFX_RectF rt(*pRect);
-  pXFAWidget->GetRotateMatrix().TransformRect(rt);
+  CFX_RectF rt = pXFAWidget->GetRotateMatrix().TransformRect(*pRect);
   pDocEnvironment->DisplayCaret(pXFAWidget, true, &rt);
 }
 
diff --git a/xfa/fwl/cfwl_listbox.cpp b/xfa/fwl/cfwl_listbox.cpp
index ce1c0133f9..210ec1f06e 100644
--- a/xfa/fwl/cfwl_listbox.cpp
+++ b/xfa/fwl/cfwl_listbox.cpp
@@ -107,9 +107,8 @@ void CFWL_ListBox::DrawWidget(CXFA_Graphics* pGraphics,
     rtClip.height -= m_fScorllBarWidth;
   if (IsShowScrollBar(true))
     rtClip.width -= m_fScorllBarWidth;
-  matrix.TransformRect(rtClip);
 
-  pGraphics->SetClipRect(rtClip);
+  pGraphics->SetClipRect(matrix.TransformRect(rtClip));
   if ((m_pProperties->m_dwStyles & FWL_WGTSTYLE_NoBackground) == 0)
     DrawBkground(pGraphics, pTheme, &matrix);
 
diff --git a/xfa/fwl/cfwl_spinbutton.cpp b/xfa/fwl/cfwl_spinbutton.cpp
index 3119c7517a..f4ca339089 100644
--- a/xfa/fwl/cfwl_spinbutton.cpp
+++ b/xfa/fwl/cfwl_spinbutton.cpp
@@ -83,9 +83,6 @@ void CFWL_SpinButton::DrawWidget(CXFA_Graphics* pGraphics,
   if (!pGraphics)
     return;
 
-  CFX_RectF rtClip(m_rtClient);
-  matrix.TransformRect(rtClip);
-
   IFWL_ThemeProvider* pTheme = GetAvailableTheme();
   if (HasBorder())
     DrawBorder(pGraphics, CFWL_Part::Border, pTheme, matrix);
diff --git a/xfa/fwl/cfwl_widgetmgr.cpp b/xfa/fwl/cfwl_widgetmgr.cpp
index f5beb411e6..d3f2dd4655 100644
--- a/xfa/fwl/cfwl_widgetmgr.cpp
+++ b/xfa/fwl/cfwl_widgetmgr.cpp
@@ -514,8 +514,8 @@ bool CFWL_WidgetMgr::IsNeedRepaint(CFWL_Widget* pWidget,
     return true;
   }
 
-  CFX_RectF rtWidget(0, 0, pWidget->GetWidgetRect().Size());
-  pMatrix->TransformRect(rtWidget);
+  CFX_RectF rtWidget =
+      pMatrix->TransformRect(CFX_RectF(0, 0, pWidget->GetWidgetRect().Size()));
   if (!rtWidget.IntersectWith(rtDirty))
     return false;
 
@@ -593,7 +593,7 @@ bool CFWL_WidgetMgr::IsNeedRepaint(CFWL_Widget* pWidget,
   if (repaintPoint > 0)
     return true;
 
-  pMatrix->TransformRect(rtChilds);
+  rtChilds = pMatrix->TransformRect(rtChilds);
   if (rtChilds.Contains(rtDirty) || rtChilds.Contains(rtWidget))
     return false;
   return true;